[PATCH v2] emacs: support "notmuch new" as a notmuch-poll-script

[Austin Clements]

Looks good to me.

One documentation nitpick below.

Quoth Jani Nikula on Dec 12 at  9:57 pm:
> Support nil value for notmuch-poll-script to run "notmuch new" instead of
> an external script, and make this the new default. "notmuch new" is run
> using the configured notmuch-command.
> 
> This allows taking better advantage of the "notmuch new" hooks from emacs
> without intermediate scripts.
> 
> Signed-off-by: Jani Nikula <jani at nikula.org>
> ---
>  emacs/notmuch.el |   34 ++++++++++++++++++++++++----------
>  1 files changed, 24 insertions(+), 10 deletions(-)
> 
> diff --git a/emacs/notmuch.el b/emacs/notmuch.el
> index 8936149..5a8ab9d 100644
> --- a/emacs/notmuch.el
> +++ b/emacs/notmuch.el
> @@ -965,28 +965,42 @@ same relative position within the new buffer."
>      (notmuch-search query oldest-first target-thread target-line continuation)
>      (goto-char (point-min))))
>  
> -(defcustom notmuch-poll-script ""
> +(defcustom notmuch-poll-script nil
>    "An external script to incorporate new mail into the notmuch database.
>  
> -If this variable is non empty, then it should name a script to be
> -invoked by `notmuch-search-poll-and-refresh-view' and
> +This variable controls the action invoked by
> +`notmuch-search-poll-and-refresh-view' and
>  `notmuch-hello-poll-and-update' (each have a default keybinding
> -of 'G'). The script could do any of the following depending on
> +of 'G') to incorporate new mail into the notmuch database.
> +
> +If this variable is non empty, then it should name an external
> +script to be run. If set to an empty string, no action is
> +invoked. Finally, if set to nil (the default), \"notmuch new\" is
> +run using the command specified by `notmuch-command'.

The default should probably be given first.  Also, "non empty" is a
bit confusing, since nothing has been said about it being a string at
that point.  So, perhaps something like

If set to nil (the default), new mail is processed by invoking
\"notmuch new\".  Otherwise, this should be set to a string that gives
the name of an external script that processes new mail.  If set to the
empty string, no command will be run.

> +
> +The external script could do any of the following depending on
>  the user's needs:
>  
>  1. Invoke a program to transfer mail to the local mail store
>  2. Invoke \"notmuch new\" to incorporate the new mail
> -3. Invoke one or more \"notmuch tag\" commands to classify the mail"
> -  :type 'string
> +3. Invoke one or more \"notmuch tag\" commands to classify the mail
> +
> +Note that the same can be achieved through \"notmuch new\" hooks."
> +  :type '(choice (const :tag "Notmuch new" nil)
> +		 (const :tag "Disabled" "")
> +		 (string :tag "Custom script"))
>    :group 'notmuch)
>  
>  (defun notmuch-poll ()
> -  "Run external script to import mail.
> +  "Run \"notmuch new\" or an external script to import mail.
>  
> -Invokes `notmuch-poll-script' if it is not set to an empty string."
> +Invokes `notmuch-poll-script', \"notmuch new\", or does nothing
> +depending on the value of `notmuch-poll-script'."
>    (interactive)
> -  (if (not (string= notmuch-poll-script ""))
> -      (call-process notmuch-poll-script nil nil)))
> +  (if (stringp notmuch-poll-script)
> +      (if (not (string= notmuch-poll-script ""))
> +	  (call-process notmuch-poll-script nil nil))
> +    (call-process notmuch-command nil nil nil "new")))
>  
>  (defun notmuch-search-poll-and-refresh-view ()
>    "Invoke `notmuch-poll' to import mail, then refresh the current view."